Would you say this approach could be effective?

With $100k, focusing on properties that offer high rental demand or flipping potential could allow you to leverage your funds effectively, especially in your booming area. 

If you can self manage effectively, you will find good cash flow there.

Ultimately I just raised rents and got better with outsourcing the maintenance in a cost effective way (wasn't doing that very well before).

I share that personal story, not to throw shade on any who have had a bad experience with bad tenants on the program, because they do exist, but to shed light on how effective and life-changing it can be when the users leverage it as intended, and the landlord also gains by housing those types of tenants.

We also commit to going to our STR every 4-6 weeks and checking in, it is an extra cost but has bore fruit for us.

The purpose of a landing page is to quickly and effectively convince a person who is genuinely considering selling their house at a discount to leave their contact details so your acquisition agent can reach out to them.Anything that hinders this process will ultimately LOSE you money.

I've come across agencies advertising on Facebook and Instagram that offer very cost-effective designs.

They also cost money to run effectively.   

Chris is spot on here, the new law is going to be in effect from Friday first of November.